'acid-etch technique' can also refer to...

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A technique for bonding resin-based materials to enamel or dentine. An acid, usually phosphoric acid, is applied in either gel or liquid form to the previously dried and isolated tooth surface for about 30 seconds. The dissolution of the mineral element of the tooth creates micro-porosities into which the subsequently applied unfilled resin can flow and provide a mechanical lock by means of resin tags. It is used to bond fissure sealants, restorative materials, orthodontic bands, and adhesive bridges (prostheses).